【摘要】 本文对在弹塑性条件下工程小裂纹的疲劳扩展规律进行了分析研究。给出了用△J积分作为在弹塑性条件下疲劳裂纹扩展主要控制参数的表达式。对工程小裂纹在缺口循环塑性区中的扩展规律提出了用修正的△J_eff积分描述和分析的表达方法,并与试验结果进行了比较。更多还原

【Abstract】 The fatigue crack growth behaviour of engineering small cracks under elasto-plastic condition is studied. The J-integral expression as a main control parameter of fatigue crack growth under elasto-plastic condition is presented.It is suggested that the modified ΔJeft-integral can he used as a main control parameter for engineering cracks in cyclic and plastic area of a notch. The method was verified by the experimental results.更多还原